Can social security be medical insurance?

Take Beijing as an example. In the past, the insured had to pay medical expenses in advance, and they could only be reimbursed after two or three months. When seeing a doctor or staying in hospital, the insured person needs to pay his own expenses first, and then apply to the relevant departments for reimbursement. With the social security card, the insured person does not need to bring a lot of cash to the hospital, and the social security card has achieved "zero advance". After holding the card for medical treatment, the patient only needs to pay the medical expenses paid by the individual and at his own expense, and the expenses that should be reimbursed are directly settled by the medical institution and the medical insurance department.